Hi Guys! Not sure if this is of interest to you, but I've created some bestiary cards for use with B/X and LL that are easily used with ACKS. They're available at DTRPG but I won't post a link in case that sort of thing is frowned upon. The 6"x6" cards contain all pertinent information such as armor class and hit dice, but also include full details on treasure, saving throws, and "to hit" numbers.
Gulf Road Games has released the first half of its OSR bestiary card line, covering letters A-J. The 6"x6" cards contain all pertinent information such as armor class and hit dice, but also include full details on treasure, saving throws, and "to hit" numbers! The cards are directly compatible with Labyrinth Lord and the Basic/Expert set from 1981. They are also easily used with Adventurer Conqueror King and Swords & Wizardry.